Density functional theory study of β-hairpins in antiparallel β-sheets, a new classification based upon H-bond topology.
Density functional theory study of β-hairpins in antiparallel β-sheets, a new classification based upon H-bond topology.
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DOI:
10.1021/bi3006785
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发表时间:
2012-07-10
期刊:
影响因子:
2.9
通讯作者:
Dannenberg JJ
中科院分区:
文献类型:
--
作者:
Roy D;Pohl G;Ali-Torres J;Marianski M;Dannenberg JJ
We present a new classification of β-turns specific to antiparallel β-sheets based upon the topology of H-bond formation. This classification results from ONIOM calculations using B3LYP/D95** DFT and AM1 semiempirical calculations as the high and low levels respectively. We chose acetyl(Ala)6NH2 as a model system as it is the simplest all alanine system that can form all the H-bonds required for a β-turn in a sheet. Of the ten different conformation we have found, the most stable structures have C7 cyclic H-bonds in place of the C10 interactions specified in the classic definition. Also, the chiralities specified for the i+1st and i+2nd residues in the classic definition disappear when the structures are optimized using our techniques, as the energetic differences between the four diastereomers of each structure are not substantial for eight of the ten conformations.
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影响因子:
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DOI:
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